<div data-bind="dxDropDownMenu: { buttonText: 'Show menu', dataSource: dropDownMenuData, buttonIcon: icon }"></div>
<div class="dx-fieldset">
  <div class="dx-field">
    <div class="dx-field-label">Icon</div>
    <div class="dx-field-value" data-bind="dxSelectBox: { dataSource: iconsDataSource, value: icon }"></div>
  </div>
</div>